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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Materials Science

Background:

  • Surface plasmons are collective electron oscillations at metal-dielectric interfaces.
  • Efficient and localized generation of plasmons is crucial for nanophotonic applications.
  • Existing methods for plasmon generation often lack efficiency or spatial control.

Purpose of the Study:

  • To investigate the efficiency of generating propagating plasmons using electron beams.
  • To explore plasmon excitation in diverse nanostructure geometries.
  • To demonstrate a reliable method for localized plasmon generation.

Main Methods:

  • Electron beam irradiation of gold thin films, cavities, nanowires, and nanoparticle arrays.
  • Characterization of plasmon excitation yields and modes.
  • Analysis of plasmon temporal evolution and spectral distribution.

Main Results:

  • High excitation yields of up to 10^-2 plasmons per electron were achieved across visible and near-infrared spectra.
  • Different plasmon modes (symmetric, antisymmetric, leaky) were excited depending on film thickness and support.
  • Leaky plasmons in supported films showed excitation probabilities exceeding one plasmon per electron.
  • Guided plasmons were successfully generated in metallic nanoparticle arrays.

Conclusions:

  • Electron bombardment is a highly efficient method for generating propagating plasmons.
  • This technique allows for precise spatial control over plasmon generation.
  • The findings offer a solution for localized plasmon excitation, advancing nanophotonics.